As Iṃgor looked onto the main street while passing through a crossing with a path that crosses the main street he saw Alex jump from one roof to another on the other side of the main street.
Reverting his focus onto the map of the tracking spell he smiled; a Y crossing was up ahead on the main street, Joshua had to decide where to go. He could block one way, and if Alex would be aware of this too, he could block the other way. As Iṃgor couldn't know for sure, he asked his familiar to block the way instead. Both moved as quickly as they could to get there before Joshua does. If Joshua was to choose the path which he blocked, Iṃgor planned to use a reflex to stop him, or at least slow him down. He'd shout "HALT" as loud as possible to startle everyone around by surprise.